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Objective

Humans must survive six waves of escalating zombie attacks and escape through the portal after the final wave. Build barricades, buy weapons, and protect the Arcane Sigil.

Zombies must eliminate all humans. Every human who falls rises as one of the horde. Tear down barricades, overwhelm the survivors, and let nothing escape.

Controls & Actions

Currency System

Blood Armor

Dealing melee damage to zombies grants Blood Armor, a protective layer forged from aggression. The more violence you inflict, the harder you are to kill. Blood Armor absorbs a portion of incoming damage, rewarding those who fight on the front lines.

Weapon Slots

Players carry weapons across multiple slots, accessible with the number keys 1–6 or the scroll wheel. Slots are categorized by weapon type: primary firearms, sidearms, melee weapons, tools, and deployables. Every player starts with their fists. You're not limited to how many you can hold.

Primary

e.g. M4A1

Secondary

e.g. USP

Melee

e.g. Fists

Tool

e.g. Hammer

Consumables

e.g. Grenade

Deployable

e.g. Arsenal Crate

Combat Overview

Weapons range from pistols and shotguns to assault rifles and energy weapons, each with their own ammo type. Headshots deal increased damage. All combat is lag-compensated, so what you see on your screen is what counts.

The Hammer is a multi-purpose tool: it repairs damaged buildables, places and removes nails, and can freeze objects in place with X.

Ammo Types

Different weapons consume different ammunition. Keep your reserves stocked.

Arsenal Crates

Arsenal Crates are portable weapon shops that players can purchase and deploy into the world. Once placed, any human can interact with a crate to buy weapons and supplies using Regular Points. Each player can only deploy one if they dont have one already or far enough away from another Arsenal Crate. Crates can be destroyed by zombies, so place them wisely.

Resupply Crates

A deployable resupply station that humans can place in the world. Once active, nearby players can interact with it to restock ammunition. Can be destroyed by zombies.

Buildable Objects

Scattered throughout the map are physics objects (furniture, crates, shelving, appliances) that can be grabbed, carried, and positioned to form barricades. Press E to grab an object, use the scroll wheel to push or pull it, and hold R while moving the mouse to rotate it. Each buildable has health that determines how much punishment it can withstand.

Nail System

Use the Hammer's secondary attack to nail buildables to walls, floors, or other buildables. Each buildable supports up to 4 nails. Nails create rigid constraints between objects, holding your barricade together.

• Nailing to the world creates a Foundation. The buildable freezes in place and anchors everything connected to it
• Foundations anchor entire clusters (up to 3 hops from a foundation) of connected buildables
• Each nail contributes a quarter of the buildable's base health; repairs grant 5s of reinforced 10% damage reduction
• Hold R on a buildable with the Hammer to remove all its nails
• Destroying a foundation can collapse the entire cluster it supports

Health & Destruction

Only zombies can damage buildables. Destroying barricade objects awards Dark Points to the attacker. When a buildable is destroyed, it shatters and is removed from the scene.

The Hammer's primary attack repairs damaged buildables. Keep your barricades maintained. Neglected walls crumble fast.

Phasing

Humans can press Z to phase through foundation buildables at greatly reduced speed. This lets you pass through your own barricades without dismantling them, though you're vulnerable while phasing.

Required Components

Every Bloodsigil map needs the following GameObjects and components for the game to function:

Optional Components

Testing Your Map

Mappers can host a restricted Map Test session without needing to be on the official whitelist.

Add the following to your S&box host launch arguments:

+bs_maptest 1

When this convar is set the server creates a Friends Only lobby capped at 4 players. The lobby name is automatically set to [Map Test] <Map Title>, so collaborators can find it in the Steam friends list or server browser.

• Listen server: share your Steam ID and friends can connect via connect <SteamID> or join through the Steam friends list.
• Dedicated server: the session appears in the server browser and Steam friends list automatically.
• A yellow MAP TEST MODE overlay is shown to all connected players as a reminder.

Design Tips

• Place sigil spawns in distinct areas so each relocation feels like defending a new position.
• Give zombies multiple routes of attack. Avoid single-choke designs that make barricading trivial.
• Scatter plenty of physics props throughout the map as barricade building materials.
• Bake NavMesh over all walkable surfaces, this includes `Is Blocker` area navmesh objects. You should also make `leap-required` navmesh links that can tell AI and bots with leaping capabilities to traverse via their abilities.
• Consider vertical gameplay. Zombies can jump over low barricades.
• You only need to place zombie spawns and sigil spawns explicitly. Human spawn points come from the Sigil prefab itself, which contains a BloodsigilSpawnPoint child object.
• Add the nobuild tag to props you do not want players to nail barricades to. Objects with this tag are excluded from nail placement traces. Use it on scenery, decorative geometry, or any surface that should remain unnailable.